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我有一个视图控制器，我想检查用户是否允许应用程序使用他们的位置。如果他们接受，那么应用程序从 RootViewController 移动到 OffersViewController，如果他们拒绝，那么他们应该继续使用 OffersNoGPSViewController。

目前，如果用户说“允许”，如果他们说“不允许”，它会保留在 RootViewController 上。

当他们在触摸“确定”并允许应用程序使用他们的位置后移动到 OffersViewController 时，我也会收到这个“开始/结束外观的不平衡调用”警告。

谢谢您的帮助。这是我的代码：

- (void)locationUpdate:(CLLocation *)location {
    locLabel.text = [location description];

    NSLog(@"auth status is %u", [CLLocationManager authorizationStatus]);

    if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorized) {
        [self performSegueWithIdentifier: @"SegueOffersGPS" sender: self];

    } else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied)

    [self performSegueWithIdentifier: @"SegueOffersNoGPS" sender: self];


}

- (void)locationError:(NSError *)error {
    locLabel.text = [error description];
}


- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"SegueOffersNoGPS"])
    {
        OffersViewController *vc = [segue destinationViewController];
        //vc.dataThatINeedFromTheFirstViewController = self.theDataINeedToPass;

        NSLog(@"auth status no GPS");
    }

    if ([[segue identifier] isEqualToString:@"SegueOffersGPS"])
    {
        OffersViewController *vc = [segue destinationViewController];


        //vc.dataThatINeedFromTheFirstViewController = self.theDataINeedToPass;


        NSLog(@"auth status is GPS");

    }
}

我完整的 RootViewController 代码：

  @interface RootViewController ()

@end

@implementation RootViewController
@synthesize CLController;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

}

-(void) viewWillAppear:(BOOL)animated {

    CLController = [[CoreLocationController alloc] init];
    CLController.delegate = self;
    [CLController.locMgr startUpdatingLocation];

    NSLog(@"RootViewController");

    [CLController.locMgr startUpdatingLocation];
//    
//    if ([CLLocationManager authorizationStatus] ==3) {
//        [self performSegueWithIdentifier: @"SegueOffersGPS" sender: self];
//        
//        
//    }
//    if ([CLLocationManager authorizationStatus] !=3) {
//        [self performSegueWithIdentifier: @"SegueOffersNoGPS" sender: self];
//    }

}

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {

    if (status == kCLAuthorizationStatusDenied) {
        // denied
        [self performSegueWithIdentifier: @"SegueOffersNoGPS" sender: self];
        [CLController.locMgr stopUpdatingLocation];


    }
    else if (status == kCLAuthorizationStatusAuthorized) {
        // allowed
        [self performSegueWithIdentifier: @"SegueOffersGPS" sender: self];
        [CLController.locMgr stopUpdatingLocation];
    }
}

- (void)locationUpdate:(CLLocation *)location {
    //locLabel.text = [location description];

    NSLog(@"auth status is %u", [CLLocationManager authorizationStatus]);

    if ([CLLocationManager authorizationStatus] ==3) {
        [self performSegueWithIdentifier: @"SegueOffersGPS" sender: self];

    }
    if ([CLLocationManager authorizationStatus] !=3) {
        [self performSegueWithIdentifier: @"SegueOffersNoGPS" sender: self];

    }      
}

- (void)locationError:(NSError *)error {

    [self performSegueWithIdentifier: @"SegueOffersNoGPS" sender: self];

}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"SegueOffersNoGPS"])
    {
        self.navigationController.toolbarHidden=YES;

        NSLog(@"auth status no GPS");
    }

    if ([[segue identifier] isEqualToString:@"SegueOffersGPS"])
    {
        self.navigationController.toolbarHidden=NO;

        NSLog(@"auth status is GPS");

    }
}

-(void)viewDidDisappear:(BOOL)animated {

    [CLController.locMgr stopUpdatingLocation];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
4

1 回答 1

2

如果用户不允许定位服务，则永远不会调用位置更新方法，并且您对状态的检查也永远不会发生。尝试实现 CLLocationManagerDelegate 的locationManager:didChangeAuthorizationStatus:方法。当用户在“允许定位服务”警报中选择是或否时，它会被调用。

于 2013-01-31T05:14:56.273 回答